The popular version I'm aware of matches the description on wiki: he poisoned himself shortly after capture. However, I ran into a documentary which speculates that the person who died there was not really Himmler but his double. This is supposedly supported by dental records not matching the person who died. While this sounds rather dubious, I'm interested in a well sourced account of what happened.
Thanks.
I have seen no credible account that Himmler escaped and a double died in his place.
Despite having continuously assured his SS officers and men that he ultimately would take responsibility for all of their actions, the end of the war found Himmler dressed in Secret Field Police uniform with papers in the name of Heinrich Hitzinger. Captured by Russian soldiers on May 20, 1945, he was turned over to the British, to whom he eventually confessed his identity. While undergoing a body search on May 23, 1945, Himmler killed himself by biting down on a cyanide capsule hidden in his mouth for that very purpose. SOURCE